Grace sings "Being Alive" by Stephen Sondheim (from "Company"). She also sings a little bit of "Send in the Clowns", also by Stephen Sondheim.
Robert Kariakin was credited as Waiter, but no waiter appeared in the episode. His lines were deleted from the cafe scene.
Jack: You know this is the deep end?
Will: I know. You'll be there.
(Will & Jack hold hands and breathe)
Jack: Okay. One... Two... Jump!
(Will & Jack jump in. Jack pops up, will is off camera)
Jack: See, Will, that wasn't so bad. Oh, look, you've already taught yourself the dead man's float! ...OOH!
This episode, Jack says that he has known Will for 17 years, last episode Will claimed to be 41 years old; that would mean he met Jack when he was 24 years old, but in the episode "Lows in the Mid-Eighties" he met Jack while he was in college in 1985, which was 20 years ago. And even that is wrong, because jack was 30 in 1999 from "Big Brother Is Coming." Can anyone get their age right?
In Season 3, episode "An Old-Fashioned Piano Party", Will was invited to go scuba diving with Joe & Larry. In order to scuba dive, you would need to know how to swim. Why would Will need to learn how to swim now?
In the scene where Will & Jack are first encountering the swimming pool, they are both remarking about wearing speedos, yet they are both wearing baggy swimming trunks.